Have you updated Flash in awhile? (remember, you have to update Flash to your system, but to Internet Explorer too, even if you don't use it). You might try updating Adobe Air too (I don't know what version of Poser you have).

Edit: OK, you have Poser Pro - update Adobe AIR. May as well do Flash too just to cover all the bases. You can also try clearing your Poser cache.

Laurie