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To be able to use this patch take to following actions:
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1. Close down QINSy (Online/Replay)
2. Go to C:\Program Files (x86)\QPS\QINSy\9.1.1 (Default installation location)
3. Rename original files by adding "_org" behind them e.g.:
   DspNavigation.exe to DspNavigation_org.exe (_original)

4. Copy the files from this zip file to C:\Program Files (x86)\QPS\QINSy\9.1.1 
5. Start QINSy again 


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Reason for this Patch:
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Displays - Navigation - CAD - Line Planning/Background - Disappearing


We had reports that the Survey lines / Line planning and/or Background files are disappearing when zooming or at certain chart orientations.
This was introduced due to performance improvements that were implemented for showing bigger files and to draw (refresh) the CAD data faster. 

We had to roll back these improvements to solve the problem in a timely manner.

We are again looking into the performance improvements and released a component which will solve the problem of the data disappearing.