Some morrowind merchants have gold pieces (septims) for sale, usually bundled to set of five (5) and sell it with price of eight. Other variations exists too. Also, for some reason Oblivion character Bremman Senyan of knights of the thorn was in Vivec, mages guild and the transport mage Flacassia Fauseius was nowhere to found.
At some point between morroblivion installation and this bug i had completed the quest, The Wayward Knight.
Something similar happened in Shushishi cave, where the key person Halof was completely missing.