Formatting text - bugs?

Hi

Whilst I'm here I thought I had better get this off my chest too.

I've been editing some text recently, adding bold to certain words, etc. Now when I go back into any text box the formatting disappears from the text within it. On one occassion I underlined some text in one box, went to another slide to edit some text and when I opened it all the text suddenly appeared underlined. Any ideas? This isnt a show stopper but it is wasting some time.

Help appreciated.