Are your R scripts being run as R Reports within your LabKey server, or are you running the R script on a separate session and reading data from your LabKey server? Also, what version of LabKey are you using? The fix for the original issue in the thread was checked in to the 16.3 release of LabKey server, so if your issue is the same, you would need to get the 16.3 release version later than r48647 to have the fix.
-Cory