Argh what a pain.
This is what the title should look like:
And if I either wait a while or maybe do some small changes (I have no idea what makes this happen, seriously just waiting a few minutes and it changes back to blurry in preview) OR if I export it, it looks like this:
Here is my sequence settings:
And here is my export settings:
Also some exports that I've done with this material have had a flickering effect on the title. But only some?? (Export/sequence settings have not been changed between different test-exports).
Is your footage interlaced? If so set timeline to progressive.
In any case set export to progressive.