@Benc-Academie – I can confirm your problem!
German InDesign CS6 v8.0.2 on OSX 10.7.5.
@Willi – here my costruction details:
Master spread A is applied to master spread B by dragging A to B.
Then the blue rectangle on the right page on master spread B is removed.
Then master page B is applied to page 5 by dragging the left page of B to page 5.
//EDIT: Then master page B is applied to page 4 by dragging the left page of B to page 4
And here is the bug:
The magenta circle is missing in the blue rectangle.
Something is really foul here…
You can download the files from my dropbox:
https://www.dropbox.com/s/41aq6bskyilundh/MasterPageProblems_CS6_V8.0. 2.zip
MasterPageProblems_CS6_V8.0.2.zip
BeforeDragging_MasterPageProblems_CS6_v8.0.2.idml
BeforeDragging_MasterPageProblems_CS6_v8.0.2.indd
AfterDragging_MasterPageProblems_CS6_v8.0.2.idml
AfterDragging_MasterPageProblems_CS6_v8.0.2.indd
Uwe
Message was edited by: Laubender