I dont know if you read my review on annotating pdfs on the Encore 8. But the Adobe Reader feels bloated and glitchy to me on the device (it feels a bit bloated on i7 t907) Really the only desktop ap that felt that way on Encore. Ive switched to Drawboard pdf. Nice pen experience. I know that doesnt directly address your Adobe Reader problem. I have not seen that error. I'll bang on that later and see if I can reproduce.