Selection problem

Helllo,

I have a problem in BricsCAD v18, wich I haven't in earlier versions. For example: I'm working with my drawings, editing dimensions, mleaders etc. in LAYOUT. It's all ok in model space, but after a while, while working in layouts, almost all of the drawing data becomes UNSELECTABLE in that particular layout and only a program restart fixes the problem, but also just for some time until it reapeats.
Any thoughts?

Thank you

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