Always latest version (chrome autoupdates itself in the background on every computer on the world)
That means that Chrome never leaves the Beta stage - it is an elusive target and Piriform may be unable to predict where tomorrow's cookies will be kept.
My experience with Firefox was that when it went onto a rabid-release cycle then every day was a new Beta experience.
I have learnt to regard with suspicion every update of all applications.
If Chrome has updated then it has changed something and it would not surprise me if they have done something which Piriform may address with the next CCleaner update.
Piriform staff never comments so you're going to wait a while. However they do read all threads and, at an educated guess with zero inside information, are probably attempting to recreate and/or compensate for this issue. If they need more info they will post here, else that's what paid support is for.