Munchmod v3.3 - Arkvisti show wares option ends dialog and the he leaves the current area following his default behavior - unable buy sell anything from Arkvisti Mods that are not functioning properly on GemRB:
Flesh to Stone spell - the spell animation whirling effect is not centered on target but to southeast or southwest of the target many kill on the spot spells animations don't work properly bodies of slain NPCs disapear etc. many spells animations needs to be fixed but spells themselves seems to work as intended when entering the area you need to wait few second for NPCs to load Whenever NPC joins the group his equipped weapons are hidden but still occupy the weapon slot(s) - see Kinderek NPC mod sometimes random NPCs can die when you enter the area (ghost child in the Graveyard district or Alexandria in Umar Hills) when hiding in shadows NPC will become hidden immediately even if she/he fails to do so There are few caveats they should know especially when doing mega mod installation. This is strictly not putting entire blame on GemRB but I want to warn other players who wants to play with mods on GemRB.
EDIT: see below for a list of things already fixed or tracked