Yes, it seems so....
Today I was flying in CZST area, same region as yesterday, for 1.5 hours and .....surprise!!....NO GLITCHES!!!...
Only thing I did before firing up FSX was running Steve's DX10 Fixer and was scanning for nonconverted effects files. The program found few of them, I guess these are the ones from POP beta test.
After closing DX10 Fixe I fired up FSX and did today's Flight.
But I don't know if this helped oreventing the glitches....