Server is updated to 1.6.1. Unfortunately, Saga is not yet compatible with 1.6.2, but the next version is awaiting approval.
Bugs fixed in Saga 0.9.5 (players, please test these and inform me if they are truly fixed):
Ability training now works
Buildings no longer ignore settlement plot size requirements
/sunclaim will now refund building points, and reset associated signs (trading post, training camp, etc)
Potatoes are now listed correctly in the configs (no need to test this one, I already have)
Home buildings now protect all containers (not just chests)
Armour now takes durability damage from wear and tear (told you guys this one was coming)
The bug with not being able to siege not-yet-owned settlements is not a bug. You cannot be standing in a border plot to siege a settlement, you must be in one of the non-border plots. If the settlement doesn't have any plots that do not border on the "wilderness," the settlement will be un-siege-able.
Fire Resistance potions are not fixed yet, the dev is working on them.