The "join" bug happened several times during our heroes vs. heroes raids, so, it's not only when preparing heroes vs. villains raids.
ok amended it to reflect that 
Only had it happen to us in hero v villains ones.
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1 - Joining a raid.....Thanks to the PD's we found that there were some issues with people not getting the join option. It appears to this can happen in any kind of base raids.(have /bugged this)
The join option is found unde
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This bug can be overcome by going into a different zone. Not sure if this is still the case as with all the base raids I have done now, we have all gotten in.
I also add another point.
7) Be careful about bases with defenses as being killed by a defense will result in debt.
Heros
Max Powerz: Lv 50 Tanker
Villains
Max Khaos: Lv 50
Overlord of E.V.I.L.
My Brute - http://maxy-khaos.mybrute.com/
LF SG! Arc ID# 193083
tried zoning and logging and didnt fix it for us :/
Just some stuff people might want to be aware of.
Base raiding is definately fun, however there are some potential complications with it. So thought after doing a few base raids I would jot some stuff down.
1 - Joining a raid.....Thanks to the PD's we found that there were some issues with people not getting the join option. It appears to this can happen in any kind of base raids.(have /bugged this)
The join option is found under
SUPER - RAID - JOIN
It is timed and only available for about 5 mins.
2 - It can get mighty laggy (turn your graphics way down....(you know the setting that turns everyone into smiley primary colour blocks should do)....if its just for fun you might want to consider only using 8 man teams. Also its a lot faster arranging these so folks wont have to wait around.
3 - You win by destroying/disabling the dimensional anchors. These are little round things on the walls in some rooms (I'll try remember to post screenshots of some when I get home). Smash these to win, or place disruptor pylons (the things made from salvage on basic worktables) in the same rooms. It is worth noting that unlike vault doors, these things cant be AS'd (again have /bugged)
4 - If you die you can rez in your med lab, if your med lab has gone you will rez at the hospital of the zone you enter base from. Eg if you enter from st martials, you will spawn at the st martials hospital. Therefore if you dont want to run half way accross the zone to get to the base portal. So make sure to zone in from either mercy, sharkhead or nerva archipelego. These zones all have hospitals nearbase portals. (obviously this only applies if your being raided by someone else)
6 - Your base resets to its original state afterwards if it is an instant raid (eg one not scheduled for an item of power).
Have probably missed some stuff, but those are the questions and points folks often arent aware of. Hope that helps and happy raiding folks!