Answered
Using l:=Solutions(...) is a handy way to get a list of values of interest.
I like to use these values subsequently using shortcut l(1), l(2),....
This is working most of the times, but not in this example where these values are parameters to Integral (see attached example).
So x_1:=l(1) and subsequently Integral(..,x_1,...) is working, while Integral(...,l(1),...) crashes immediately.
Files:
199b.ggb
The same question 
Is the attached file OK for you in the new version (v411)?
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