I am glad reset worked. There is one potential issue if you have the first version of the 990 firmware update and not the second. There was a bug in the first version of the 990 firmware update, so if you set the sub trim to -15 dB and the 2 channel offset to -8 dB, it incorrectly goes to maximum sub output. This was explained by Scott at Model 990 Sub Trim Update . There is no problem at setting away from the extremes.

After installing the first version of the software update successfully, I never bothered with the fix because my sub level is not set that low and I can compensate with the sub gain/volume. Anyway, I'm a Mac guy and have to borrow a PC to do the updates, which is a pain.