OE53 and OE10 and OE90

We're testing an MSP update (9.0.1 MSP4), and we use Order Entry quite extensively. This week, I've gotten this message or a similar message in both OE10 and OE90 when I try to do a change or an inquire action. So, I initially added my network login name into OE53, and that seemed to fix the issue with OE10. When I tried to change a hold code in OE90.1, I got the same error message. I added the NT name from listusermap like NT00230 or something similar to that, and that seems to have resolved the issue. To me, this is weird. Has anyone come across this issue within the 901 Applications for Order Entry?