Funny that 4.5 is more stable than 4.6. BerryReview wrote today that Vodafone released DM 4.6. DM 4.5 is very slow but for some reason I prefer it to DM 4.3, so I'll keep it for now. The version of DM 4.6 released by Vodafone must have media manager in it, due to the relatively huge file size of the download. I also prefer the leaner DM w/o media manager. I already have Nero and very much prefer it to Roxio and also know from past problems that it's best not to have both installed on a computer at the same time.
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Thx to all for the great advice!