weird 11.2.0.4 db link issue

I patched our databases on unix and on windows.... now one app won't work because it goes like this:

From 11.2.0.4 Unix --> db link --> 11.2.0.4.16 on win32 view + db link --> 10.1 on (something, it's another organization's site).

(no I can't tell them 10.1 is no longer supported etc., cue the funeral parlor music)

Well because there are two db links in a row, connectivity failed after the latest 11.2.0.4 PSU was applied and I upgrade the database from 11.2.0.3 to 11.2.0.4.

The latest psu was applied to 11g on win32, no change.

Any ideas? Maybe there's a patch I don't know about to fix this.

Meanwhile I suggested to the developer that he might want to use mviews instead of views in the middle, but it would be easier if we just fixed that bug.

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