Error 59504 : File "UNKNOWN" is already open.

[Fran=?ISO-8859-1?B?5w==?=ois Van Lerberghe]

Hello,

What is the meaning of the error #59504 : File "UNKNOWN" is already open." ?
I'm getting this error when I try to issue an SQL Select. If I try again the
same SQL query, no problem. This error is raised not consistently from times
to times.

V4RB 4.9 (no problem with 4.3), Mac OS 10.6.8
RealStudio 2010r3.2

Thank you.

François Van Lerberghe
Rue Thier Monty, 15 A
4570 Marchin
+32 (0)85 25 08 25