Having finally decided to upgrade to the HiFi package this morning I was somewhat displeased to discover that I could no longer stream anything from Tidal. All of the error messages previously mentioned in this thread appeared, this affected items existing in my library and “new” items.
Fortunately, after a restart of the core, everything started working again much to my relief. I shall continue to check errors, but for now I will experiment with MQA comparisons.