Error code 38 on entering cash shop

This error seems to be attached to the mains of the account. Same problem is happening to me. But only the mains of two of my accts is having that issue. My partner Jay (Pendal) is having the same problem with his main. He did a test and switched his main on Nexon's website just to see what it would do but hasn't had a chance (at work) to see if it worked.

I'm on windows 7 and he's on Vista