And at many different times running the crons and rebuilding caches ALL NO GOOD
I see the thread you first reported this (
https://xenforo.com/community/threads/not-seeing-item-count.119982/).
Although you didn't get a response from me or another member of the team, the ball was sort of left in your court, so to speak, because your final reply in that thread suggested you were going to do some further testing.
Of course, regardless, if you feel like an issue has not been dealt with, and a problem persists, it's perfectly fine in that case to bump it. We don't necessarily guarantee any post on the forum will be replied to by a member of the development or support team, and we recommend ticket support if you require a definite staff reply or if you're experiencing a particularly troublesome issue.
Certainly if the issue is still outstanding, you're more than welcome to submit a ticket, please include one or more accounts where the issue can be reproduced/demonstrated, and FTP access. We might benefit from DB access for this issue, too, if possible (such as PhpMyAdmin).
My site is now stuffed because updates don't remove leftovers from previous versions etc
You'll have to clarify this in more detail because I'm not sure what you're referring to here or in what way your site would be "stuffed" as a result.
However, all those 4,000 media files are still in the data and internal data folders bloating my site, my disk space and my backups
When you do an XF to XF import, only the post and conversation message attachments are imported, so this doesn't seem correct.
Still working on it but it seems my issue is now fixed...crikey, I am hoping mad about all this. All this is just with my local backup site, subject to further testing I still have to apply a fix to my live site which means closing it down and doing all this and reopening the site.
As I stated above, if this XF to XF import saga has been to solve the issue you reported here:
https://xenforo.com/community/threads/not-seeing-item-count.119982/ then more support would have been available had you sought it, and we would have never recommended doing any of the things you took it upon yourself to do. I can't think of a single feasible issue that would ever require an XF to XF import or a complete reinstall of an add-on to solve.
To reiterate I suggest creating a ticket so we can move forward with the root issue (
https://xenforo.com/community/threads/not-seeing-item-count.119982/).