I just discovered that a certain type of RGN/RGO grenade created by "Unknown community author" has problems with the ACE fragmentation scripts.They are described as 'offensive/defensive fragmentation impact grenades' and appear in the grenades list in the Arsenal just before the RDG-2 (White) smoke grenades. Avoid using them. 
When you throw them, the fragmentation comes out of the grenade as soon as it leaves your hand. Needless to say getting a face full of shrapnel from you own grenade is not a good way to start an assault!
They're anti-personnel grenades, but it's never specified it was anti-personnell towards friendlies! 
Other grenades affected like this that release shrapnel *only* on detonation are the RHS flashbangs and concussion grenades.
ACE's own M84s are unaffected though.
SAS_Master - Regimental Sergeant Major
GCHQ
"He's trusting you to do your job which is to clear that corner! Nothing else!"
Yes, only ACE FB are actually working, this is a known thing
I've no idea about the grenades tho
SAS_Capt_Fluffy
Captain
"Let's just wing it" -Fluffy on things we should most definitely not wing
I think it's best to stay away from those grenades
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Who Dares Wins!!