Slow cursor in full screen mode

I’m using the downloadable trial version (v 1.2.5). I’ve got two questions.

  1. In full-screen mode the cursor takes about 8 seconds to move along a line of 100 characters. This is annoying when you’re trying to delete text. It seems to take an age. When I get out of full-screen mode, the problem disappears. Any ideas?

  2. I’m using this in Windows XP at the moment, but when they’ve got a working and reliable Linux version I’d probably prefer that. Would I have to buy it again, or would one licence cover all variants?

I have been using trial version and it was great. Now I am using the paid version and keep getting a message ‘Not responding’. This occurs when I am editing text. Takes minutes for the changes to be made. thanks.