I am trying to filter for Flash spin and Gos, the easiest way I know of doing this is to use starting chips = 300, a very useful filter btw. This works on most tournaments but some of the tournaments have been saved with a 0 starting stack. As a test, for one of the tournies with a zero starting stack, I got its hand history from PokerStars to make sure nothing was missing, but it didn't update the starting stack to 300.
Edit: I had to delete the tournaments in question, 5 of them and reimport them again, then the starting stack size appeared correctly. I had a look at the hand histories for these tournaments and they don't look any different to the ones that imported correctly in the first place, so it's hard to know exactly what went wrong. As an ex-programmer, hope you don't mind me suggesting that your programmers might want to add an extra check to make sure that the starting stack size is correct, this should be easily done.