Any idea of the age of the cables (unless replaced at same time as aerial), if 15+ years would consider them as well suspect, but only a good reception meter would be able to tell this of course, you need a nice friendly aerial installer to just check that for you, at least to give peace of mind, pity you could not get the guy to test the signal to you when he fitted the new aerial.
I think they would have had I been at home. Maybe I can find out if they tested anyone else's.
I've just tested with v48 and v50 on a fairly clean Win7 install and saw no glitches with v48 and a couple with v50.
Obviously it's a different time of day so the signal might be stronger, but I wonder if it's possible for something on the PC to interfere with the signal before it gets to TsWriter, which might account for the greater number of glitches I experienced on my normal Win7.
EDIT: Logs added