Just to complicate issues, the re-occurance of the issues now seems to have resolved itself with the alternative add blocking software, am not running into issues now, or certainly not consistently. I generally leave my account open for long stretches of time (hours) through out the day as a rule.
Another thing to add, my add block 'count' went up to '328' in hotmail today, been open for around 2 hours. Have never taken note before of this number but once hotmail opens the counter app number of blocks goes up very quickly (possibly app software just making itself look good?). Hotmail trying to overwhelm the app?