Hi Carlos,
A new release is a matter of days. Hopefully this is a problem with graphics drivers, and then the new version should fix it because it is much more robust to deficient OpenGL implementations. As Harry has pointed out, this is not a universal problem; for example, we also have several Dell computers that work perfectly with build 1171.
In the meanwhile, you could try this solution:
1. Download the following zip file:
https://pixinsight.com/update-test/20150827-corelibs.zip2. Uncompress it on any folder.
3. Copy all files extracted in step 2 to the following folder, replacing existing files and folders:
C:\Program Files\PixInsight\bin
You'll need administrative rights to do this. If you have installed on a nonstandard location, change "C:\Program Files\" as appropriate.
This patch essentially applies the same changes that we have included in the new version, so it should fix this issue with a poor OpenGL implementation. Let me know.