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Some clarifications. It is "Structural Force Definition Data" that seems to somehow be formatting trouble with, even when I in the GUI fill out the structure forces. 11 structure forces are OK, failure experienced from the 12th structure force. For the time beeing I've replaced the structure force set with 30 Point Forces enabling the "force following structure" - not as flexible of course as the force has to be constant (apart from direction) during the time span.
I've also installed 2024 R2 now, and experience the same error. I've done some testing with reading from comma-separated .csv-file (the one Aqwa writes out TimeResponse.XFT is in fact not comma-separated, so when I copy and edit the .csv-copy I have to generate the commas), and the same error is observed. I therefore suspect this to be a bug, though still I'm not 100% sure of that as my testing may not be fully waterproof. If it turns out to be a bug I will report it so it hopefully can be fixed in next service pack / release. Still, I hope that there is a workaround other than the follower point force I've used this far - maybe I may edit the solver input-file (TimeResponse.dat) directly - unfortunately this far I've not found were this structure force input is found in that file.
Snap from TimeResponse.XFT that continues with a total of 1+6*12 (because of 12 structures) = 73 like it should. For 11 structures this is OK (then there is 1+6*11 = 67 coloumns and no error...