L2walker hangs while clicking upon trader

Who knows how to fix it? L2walker.exe loads CPU 99% and nothing happens. The server is interlude, ive tried bots 10.2.3-10.8.6. No1 works correctly with GM shop. As the shop contains multisell windows, 10.2.3. doesn show me trade windows. Other version just hang when i click on NPC...This problem is only with one the most important npc, others work perfectly...

Sor for my English.