Off and on but not enough to call support. There are at least two workarounds if it is happening enough.
The first, which doesn't look great, is to put the DEA# in the 2nd line of your address. Of course, that isn't bad for scripts, but looks fairly bad for letters, etc. But, then it is always there.
The second one is probably better. You go to the admin section and select SET PRESCRIPTION FORMAT and enter it in Notes on All Future Prescriptions. This will put it in the Notes to Pharmacists just under the sig.