G'day!

I'm using OE 5.50.4133.2400. For no apparent reason, when composing e-mail messages, I lose the apostrophe and get an accented capital E. This doesn't happen all the time, but often enough to be annoying.
If I close OE and then reopen it, the fonts seem to be OK for a while.
Any suggestions as to how to fix this ?

Thanks,

Ed Bebee