One quick thought: Are you a pet class? When I tried summoning the banker on the mage and chanter, I had issues. With the Druid, no issues.
If a pet class, try suspending it before summoning the banker.
Tat
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Tatanka Wolfdancer, 115 Wood Elf Druid, 9 x 300+ Master Artisan, 7 maxed trophies (dang research! :)
Michone, 115 Troll Shadowknight
Anaceup Mysleeves, 115 Erudite Mage, 2 x 300 Master Artisan
Snookims Whinslow, 112 Erudite Enchanter, 2 x 300 Master Artisan
<Inisfree>, Tunare (Seventh Hammer!)