KB319121: Exporting from Web may fail intermittently on MicroStrategy Secure Enterprise

SYMPTOM
In Strategy Secure Enterprise 10.4.x and newer, when attempting to export reports or documents from Strategy Web, the exports may fail periodically with different error messages depending on the type of export selected. Some examples include: 
 

Failed to load PDF document

or  

Excel cannot open the file <filename> because the file format or file 
extension is not valid.

 
The export sizes in most cases ends up being 0 bytes.
 
CAUSE
This is a known issue in Strategy Secure Enterprise 10.4.x. If the Web export request (ger) is received at the exact same time the Strategy Intelligence Server is writing Statistics to the Statistics database (to record the export job execution), this issue will be seen. This is the reason for the issue to be seen intermittently.
 
ACTION
This issue has been resolved and is already included in 10.4.3. It is tracked by DE53814.. 
 
WORKAROUND
If Statistics logging is disabled on the project, this issue will not be seen. 
 
The Strategy internal reference number for this issue is DE50683/DE53814.