Thanks KOR -- both good points. I checked my permissions for that public folder and found that I'm listed as an Owner. Also, something that I tried was to do a security wipe, then reactivate on the BES server. I think you're right about the Desktop Manager.
One nice benefit of upgrading to DM v5.0 is that it is blazing fast compared to v4.3 through v4.7 which were dreadfully slow.
An interesting thing I just remebered, I've got two coworkers doing what I'm trying to do with no problem. One of the coworkers has a Curve on Sprint, and one has an 8800 on AT&T. That alone makes me wonder about the OS that I've upgraded to. A downgrade is an easy enough test before I pay for a call to RIM.
"Once more unto the breach" (or whatever they say).