I would re-install your Flask directly into the same folder it currently exists and re-install any pluggins, such as the Panasonic, into there as well.
The official Flask 0.6 with the un-official 1.1 upgrade is far more stable on more systems than those Xis versions. Its a bit slower but it works.
I've also compared the output from XMPEG with Flask 0.6+1.1 and Flask leaves XMPEG for dead with regards to quality of the final pic, both using the Pana plugin.