Actually, it is the amount of information, but it isn't just ringtones. If you have more than 100 of anything, it will cause this error. 100 contacts, 100 appointments, 100 tasks, 100 notes, anything. Since I have far more than 100 (1300 contacts, 397 appointments in the next 2 weeks), I get the error every time I switch from one computer to another. There is a solution, but nobody is as yet releasing it. Microsoft has acknowledged it is a WM 6.1 problem, and they have supposedly released a patch, AKU 1.2. But either it has not actually been released, or all the providers are currently evaluating it and won't admit it.
I wrote HTC earlier today inquiring about the AKU 1.2 patch, and got the response that my provider would have to release it for them to provide it on their site. My provider is US Cellular. I called tec support, the original rep had no idea what I was talking about, but he transferred me to the tec support specifically for smartphones, and talked with a rep. She also didn't know about the problem, but searched their knowledge base. She first tried to give me the "solution" many have tried (removing the relationship, etc.), then she found the AKU 1.2 patch I had told her was the real solution, and acknowledged this was the real answer. Unfortunately, she says that Microsoft has not yet released the patch. My complaint was noted, but she said there was nothing to do until Microsoft released the patch. My response was that they needed to call Microsoft and complain, just I was doing with US Cellular.
I suggest that everyone needs to start calling your provider and asking when the patch will be made available. We need to light some fires. If I'm the only unhappy customer, that's too bad. If they start getting lots of unhappy customers, perhaps they will become a little more motivated. I seem to have been the first unhappy person to have called US Cellular.
To cut down the time you have to stay on hold, if you are a US Cellular customer, here's the direct # for the tec center that deals with smartphones: 888-996-5499
BTW, one suggestion the rep had was to reinstall WM6.1. "It won't hurt anything". I installed 6.1 it at the beginning of the week, and just got everything the way I liked it, including installing TouchFlo 2D. Even with backing stuff up, this isn't the solution I'm looking for. Has anyone else tried this? Does anyone want to? Can anyone see a reason why installing it a second time would make it work, when Microsoft has acknowledged they have a problem?