After update to IJ Ultimate 2017.2.5 Scala files full of errors

Looks like when I updated IJ to the latest release, along with all installed plugins, suddenly no symbol in the Scala files can be recognised. I tried to reload the project, refresh SBT, recompile, and nothing helped.

When I rebuild the project I get the following messages:

Information:29/09/2017, 13:51 - Compilation completed with 35 errors and 3 warnings in 7s 610ms
Warning:scala: skipping Scala files without a Scala SDK in module(s) modules
Warning:scala: skipping Scala files without a Scala SDK in module(s) tests of modules
Warning:scala: skipping Scala files without a Scala SDK in module(s) macros

And compilation errors follow. Compiling from the commandline doesn't generate any errors.

3 comments
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I've installed the EAP version and I can see the difference: the compiler server isn't running in the 2017.2.5

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Do you see the same behaviour in the latest version of Scala plugin 2017.2.7 ?

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I was able to recover it by myself. The reason really was the project dropped Scala SDK setting, and I've created a new one that make it work again.

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