Animation past frame 30 lost after save

aaráribel caađo

This might have just been due to a file glitch, but last night I was putting together a scene with 90 frames for dForce simulation purposes. When I went to render, it wasn't rendering what my camera was showing me, and after several attempts to fix it, I saved the scene, quit DS, and then reopened it. My simming remained, but the animation reverted to 31 frames, which means I lost all the final poses. Was this just a file that went buggy, or is there soome limit to how many frames you can have in a scene?