They took the Irish Civil records down around the middle of May and did some work on the system - and it seems to me to be back in operation as before, as I've been able to find the test records that were previously missing (although I've none in Mayo to check).
Some of the searches were always a little inconsistent, especially those by location or county. If an initial search by name, event type, date & county does not show up what you are looking for, it is worth starting with a much broader search - e.g. just the name and maybe a date range, then using the filters at the top gradually narrow down the results by event type, location etc
Shane