Explain plan error

[cct]

I am regularly getting strange errors when I hit F5 to show the Explain Plan window. Normally I get the message:

ORA-00911: invalid character.

When I OK the message, the cursor is immediately to the left of the trailing semi-colon. It seems to happen only when there are comments or commented out code after the semi-colon.

Any ideas?

This is version 11.0.4.1774 on Win 7 64 bit connecting to 8.1.7 database - also ISTR seen connecting to 11G db.

 

[William Robertson]

I didn't think semicolons were allowed. My guess is the tool manages to ignore trailing semicolons (similar to SQL*Plus) but that's as far as it goes.