My first post here, and it seems like a weird problem.

I've used Postgres on W****** and it's been fine. Now I've moved over to Ubuntu completely and I have a problem reading the data in the boxes. All the headings, line numbers etc are fine - it's just the data that's illegible. It looks as if it's displaying at 50% of any other text on the screen. I've tried changing the font, the colour scheme, anything that could affect the appearance, but no joy.

Any thoughts anyone?

No idea, since you don't say how you're retrieving the data, what you're displaying it with, or give any details about the process/programs you're using.

I'd check the data itself, from the postgres console, and run a query, to make sure you really ARE getting the right data. One thing, if you were using Windows, and migrated the data over...you may be enjoying some lovely Windows control characters in your import/dump file, that are causing your display woes. Check the dump file, and see what you can find...check it on the Linux system, though, not on the Windows box, since they'll not show up. You can use sed to strip out the junk (if you're doing a simple replace), and re-import the 'sanitized' file.