The 'post shrinkage' already happened in the move from UBB to VBulletin, as you can see in the older VB Questions thread, and is due to the fact that VBulleting excluded some old posts (in closed threads and for IIRC) from counting towards your total. I lost exactly 400 posts, for example.
I can't see how new posts get lost; certainly not if they did actually appear and it wasn't a software/connection error. Please verify that and report back.
The max number of images in a thread makes sense IMO. Perhaps smilies could be excluded from it, but why should they.
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