Is the issue with all forms or specific ones only?
Do you get any ORA-XXXXX errors or any other FRM-XXXXX errors?
What is your database version?
After Upgrade To R12, ORA-04023 In Compiling All Forms (Doc ID 1503874.1)
(Doc ID 757593.1) -- 6899909 - Fixes PL/SQL Error 907 and FRM-30085 errors when compiling
I tried a couple other custom forms and they compiled ok in DEV1.
Only the FRM-30085.
the DB version is 126.96.36.199.0 in both DEV1 and DEV2.