Hi SeraphMichael - This is the first time I've heard of this particular issue. Would you please let me know which other mods you had installed (even if you turned them off while testing)? Thanks!

these are my mods im using (in load order):
1: 8 max AP
2: blackring witch armor
3: crafting overhaul
4: even stronger backs
5: free pet pal
6: helaene - succubus class
7: hopefully luxurious traders
8: in-game origin armor
9: let there be tooltips
10: lohse's lute
11: more arrows and grenades
12: party test 2 (raises max party size to 9)
13: peaches skill rebalance
14: rapiers - dagger/finesse
15: rendal's NPC armor
16: rune slots epic (dependency)
17: rune slots rare (dependency)
18: rune slots uncommon (dependency)
19: rune slots back to 3 (for all gear)
20: sim's day/night cycle + dynamic weather
21: staffs in one hand
22: trade refresh
23: ressurection skillbook
24: arcanist
25: helaene - valkyrie class (this mod)

This is really old but just so you know the fletcher not coming along has nothing to do with mods. It just happens sometimes. One time I invited him to the ship and I decided to look for him before I left. No where to be found... Went back to the Sawmill and he was there. Spoke to him there and he acted as if he was aboard the Lady Vengeance and when we set sail he did not come with zero mods. I think they tried to fix Justinia commiting suicide by running into deathfog by making friendly A.I act like party members and refuse to move if no safe path is available. So if on your way in you just teleported, jumped, and dodged all the traps I believe he has no pathfinding out of the inital camp which is the now cause of this. Pure speculation, however.

Hi - same issue with storage but also have broken vendor for this mod. Brenna is there but doesnt offer trade and there is no container with spells. Act 2, driftwood. Have disabled all other mods, new save and then only enabled this one. No change.