So far, we have only heard of one customer who had an issue with Roon 1.5. We just re-installed Roon and I think that solved the issue.
In our setups, we have not had an issue.
One thing that 1.5 brings to the table is the ability to play MQA files with a non-MQA DAC. Yesterday we played quite a few Tidal MAQ "Masters" using a non-MQA DAC. It worked flawlessly. Couple this with the ability to up-sample or down-sample, and you have a system that can play high rez PCM, DSD and MQA on just about any basic DAC. Quite impressive!