
Unsolved		Vertical earthquake factor When determining the driving moment resulting from the increase in volume weight, the vertical earthquake factor is not applied. This is not OK and will be solved as soon as possible.


Unsolved		Horizontal balance calculation The results are not correct if the slip plane is situated above the phreatic line. No workaround is available.


Unsolved		The method Uplift Van does not use earthquake factors The method Uplift Van does not use earthquake factors. This may be confusing, because one is allowed to enter these factors.


Solved in 9.10.8.6		The model "Uplift Van" may end up with slip circles outside their designated zone With MStab version 9.10 the slip circle center is not automatically coupled to its zone, this depends now also on its radius. This may cause problems, resulting in a circle outside its zone. Workaround: Make a separate calculation for each radius [via menu slip planes].


Solved in 9.10.7.900		Incorrect calculation of horizontal balance The calculation of the horizontal balance is not correct, the related safety factor is therefor also affected. The formula Fw = (z_phreatic-z_slip) x gamma_w/2 should read Fw = (z_phreatic-z_slip)^2 x gamma_w/2. Also in the manual (par. 16.5) this is not stated correctly.


Solved in 9.10.7		Incorrect PCRING files in Reliability model. The output files for PCRING (*.pcr) that are made in the Reliability calculation are not correct. NB 1: In the Bishop probabilistic random field model the files are ok. NB 2: This error was not present in MStab 9.9.


Solved in 9.10		POP at Cu calculated For the shear strength model Cu calculated, the preconsolidation stress is calculated too low when the phreatic line lies above the reference level. As a consequence the POP, if specified, is not correctly used in the calculation. If you experience this problem you can contact support to receive a (beta) version in which this problem is solved.


Solved in 9.10		Reliability Analysis with design values and multiple water levels When a probabilistic calculation is defined with design values, MStab calculates mean values out of the design values. However, when multiple water levels are used, after the first calculation MStab will change these values again into mean values as if they were design values. As a result the mean values will increase every time. Workaround: Use mean values in a reliability analysis with multiple water levels.


Solved in 9.9		Design values as mean values in Reliability Analysis The program will regard the design values for soil properties as mean values when you make a calculation with the reliability option in MStab. Workaround: Supply mean values for soil properties, not design values in case you are working with the reliability option.


Solved in 9.9		Reliability Analysis and combination of strength models When a probabilistic calculation is made with more than one water level, the calculation fails if the strength model c, phi and stress are used alternately. When only c, phi or only stress tables is used, the calculation is performed correctly. Note that any single probabilistic calculation where no water levels are used, gives correct results.


Solved in 9.9		External Water Levels (Reliability model or Probabilistic random field model) It is impossible to input a negative value at Pl-lines in External Water Levels in the user interface of MStab Workaround: You can change the water level manually in the .sti file with a text editor.


Solved in 9.9		Slip circle on vertical wall with water against The water pressure is not correctly taken into account, when a slip circle ends on a vertical wall with water against. For the record, there is no problem when the vertical wall is totally whithin the slip circle. Workaround: Make the wall a little bit sloping.


Solved in 9.9		Leap in phreatic line at vertical wall When the phreatic line makes a leap at a vertical wall (e.g. sheetpiling) it can happen that MStab puts the water level at the outside of the wall at the wrong place. It is also possible that a water moment against the wall is mistakenly used or not used. Workaround: Move the concerning node(s) of the phreatic line for 1 mm.


Solved in 9.9		Error entering external water levels When entering more than one PL line for a probabilistic calculation in Water \| External Water Levels, changes are not saved when the user swiches to another Water data name without clicking OK first. Workaround: Press OK after entering the data an re-open the dialog for changing other data.


Solved in 9.9		Incorrect layer numbers in degree of consolidation dialog In the table of the Degree of consolidation dialog, layers are numbered in reverse order: the highest number is at the bottom, and number one is at the top. After selected another layer in the combo box, layers are numbered correctly.


Solved in 9.9		Importing MSeep net file When, under "Use MSeep Net" in MStab, an MSeep file is imported with more than 10000 points, error messages (access violations) are displayed and the program aborts.


Solved in version 9.8 (build 5.5)		Method Cu-calculated With method Cu-calculated the Cu is determined by the maximum of he preconsolidation stress + POP and the current effective stress. The preconsolidation stress is wrongly calculated in this version as total stress instead of effective stress.


Solved in 9.8 (build 5.4)		Importing old DOS files While importing files created in DOS versions 5.0 through 5.3 from MStab, the error message "Invalid numeric input" is displayed. Workaround: Import with a more recent DOS version of MStab and save. The new file can then be imported with the Windows version of MStab. If you do not have a more recent DOS version, please contact support@delftgeosystems.nl.


Solved in 9.8 (build 5.4)		Some modifications in input window are not remembered When some characteristics were changed in the ‘Materials’ window, for example, they were not remembered when the user clicked a material name (in the list on the left) that was too long to be displayed in full (a hint was then displayed with the full name). This problem can occur in all windows in which a list of names is displayed on the left and the characteristics of the item selected in the list of names are displayed on the right. Workaround: After modifying a property, first click on another property before going to another item on the list.


Solved in 9.8 (build 5.4)		Message 'Unknown input file format!' when opening old files. When opening an old file created with one of the first Windows versions, the message 'Unknown input file format!' may be displayed. When that happens, the file is not opened. Workaround: In the header of the input file (using Notepad, for example), after “CREATED BY” delete the text “for Windows”.