TA is more likely to crash if you try to record several games in a row without restarting it. We recommend exiting TA before playing each game when using the recorder.
You must have all the units that were enabled in the recorded game (i.e. not grayed out on TA's build restrictions menu) or unit substitutions will occur and is TA is very likely to crash as well. We strongly advise having all official Cavedog units when replaying a game (3.1 patch, Core Hedgehog, Arm Scarab, Arm Flea, Core Immolator, Arm FARK, Core Necro).
.unitsonly severely degrades replay performance.
Rewinding a game may ruin the quality, especially if speed has been changed from 100%. If it isn't working for you, don't do it.
TA will occasionally crash or freeze when replaying a game. We're working on this, but need you to submit as detailed bug reports as possible. Please use the bug-report form
In case of weird lag the new timer mode possibly makes TA more susceptible to crashes. Try running without it and see if things get better.
The patches aren't 100% efficient:
.fixfacexps only protects your units for 3 seconds (too long a time and it becomes a trainer) so if lag is horribly bad you will still lose units. However at the rate of one every third second at least your entire build queue won't go kaboom.
.protectdt sometimes overlooks DT packets, so it isn't 100% effective.