"date format not recognised" in DBMS_SESSION, on page over db_link

Hi,
I have an Apex 4.0 page which has a region that gets data constituted from a connection across a database link.
The host database is 11.1.0.6 and the remote database is 9.0.1. (Both Standard Edition)
I am using EPG.
Intermittently, I receive the following error (having turned debugging on):
Wed, 25 Aug 2010 10:21:53 GMT
ORA-20867: ORA-01821: date format not recognized
ORA-02063: preceding line from CLIFF
ORA-06512: at "SYS.DBMS_SESSION", line 157
ORA-06512: at "APEX_040000.WWV_FLOW_LANG", line 387
ORA-06512: at "APEX_040000.WWV_FLOW", line 9284
ORA-06512: at "APEX_040000.F", line 267
ORA-06512: at "APEX_040000.F", line 294
ORA-06512: at line 30
I'm somewhat confused as to what is causing the generation of this error.
After receiving this error, anything I else that I do that involves building 'pages' works perfectly fine. I can login/out, no problems.
However, if I try and RUN any page within my application thereafter (all of these access local DB information apart the 1 that generates the error), I continue to receive exactly the same error - no matter which page I am trying to access.
Help?
- Tony.

Hi Patrick,
No. I haven't yet applied the patchset. May do that this afternoon now.
I don't believe I've manually set any date formats anywhere. Just entered the Builder with default options (apart from choosing a theme) and away I went!!
What surprises me is that the application has no problems viewing all the data. The functionality all seems fine. I had this working on a previous setup for months,. without any problems, using version 3.2. (This wasn't migrated though, this was a rebuild from scratch.)
From further "tests", the error seems to occur when I edit the page that involves the remote data.
Normally, a user would land on the page from having used a hyperlink column on a previous page's classic report region.
The point at which it all starts to go wrong is if I connect to the page as normal, but then EDIT the page, and then try and re-run it.
The problem with the date format then re-occurs repetitively, no matter which page I try and view. Sometimes pages will load some components, but then generate odd errors with others. e.g. I have a small series of 3 dial charts, all with slightly varying SQL series (same SQL, slightly different where clause). Now I am seeing that 1 may load and 2 may give odd flash errors...
Right now, I just tried to Export my application - and I still got given the date format error!! Sub-sequent retries allowed the operation to complete successfully.
The only way I seem to be able to eradicate the recurring errors is to kill all the currently connected ANONYMOUS users in the DB, and then relog to the application.
- Tony.

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