mikey_G - thanks for the bug report, I can see the problem and am looking into it now...
Update: I've re-uploaded the program now with, what I hope is, the bug fix. Basically I hadn't put code in place to prevent springs extending when negative load is applied, since in theory this can happen. Only for some reason it was getting completely out of control under certain circumstances that I can't really be bothered to look deeply into. I've just made added bump stops at the top of spring as well as at the bottom and it doesn't seem to crash anymore. Please let me know if that's cured the issue. I only noticed it on the UF1.
Update: I've re-uploaded the program now with, what I hope is, the bug fix. Basically I hadn't put code in place to prevent springs extending when negative load is applied, since in theory this can happen. Only for some reason it was getting completely out of control under certain circumstances that I can't really be bothered to look deeply into. I've just made added bump stops at the top of spring as well as at the bottom and it doesn't seem to crash anymore. Please let me know if that's cured the issue. I only noticed it on the UF1.