I downloaded this for 4.2.1 but the overlay i.e. the last post avatar doesn't show. All I get is the default avatar... Thanks..

The shadows are for "Hot Threads" it has tobe enabled in Settings.

I use this for last posters, for me it seems to work better.
https://vborg.vbsupport.ru/showthread.php?t=275406

It is enabled.

Thanks again.. Already downloaded...

What are the settings for "posts" and "views" because the Shadow doesnt appear until it reaches those settings in posts counts & views counts.

Hot threads are on.... It was the first thing I tried, it's something to do with my CSS.

Guests also have no avatar, see image.

https://vborg.vbsupport.ru/external/2013/07/13.png

problems only with guests without Avatar. Registered users with no avatar, no problem.

I was receiving complaints from forum members, saying their mini avatar wasn't displaying when they had posted in a thread, they were just seeing the default avatar. It took me a while to figure the problem... you only see the mini avatar if you tick the 'remember me' box when you log in. If you don't tick it, you only see the default avatar.

Is this an issue with the mod or is it a permissions thing?

It is possible that its a CSS issue, but my question was what are the settings for "Posts" and "Threads" If you have Posts per Thread set at 50 the Shadow wont appear until it reaches that point and if you have the "Threads" setting at 300 views the Shadow wont appear until then, but it is an either/or setting, either 50 Posts or 300 Threads will activate the Shadow.