Segger overlay corrupted?

[Tron]

I have to folders with different versions of the nrf library installed (1.0.0 and 1.1.0-rcsomething) The dts and overlay files are identical in the 2 folders (nrf9160_pca10090ns.dts, common.dts and my project overlay file). In one project the overlaying prodess goes well: 

-- Loading <version1.0>/ncs/zephyr/boards/arm/nrf9160_pca10090/nrf9160_pca10090ns.dts as base
-- Overlaying <version1.0>/ncs/zephyr/dts/common/common.dts
-- Overlaying <version1-project>/nrf9160_pca10090ns.overlay
Device tree configuration written to <version-1-project>/build_02/zephyr/include/generated/generated_dts_board.conf

Ie, the loading of the project goes well

When I do loading of the <1.1-folder>-version, things crash: 

Error: nrf9160_pca10090ns.dts.pre.tmp:551.3-4 syntax error
FATAL ERROR: Unable to parse input tree
CMake Error at <version-1.1>/ncs/zephyr/cmake/dts.cmake:162 (message):
command failed with return code: 1
Call Stack (most recent call first):
<version-1.1>/ncs/zephyr/cmake/app/boilerplate.cmake:566 (include)
CMakeLists.txt:9 (include)

-- Configuring incomplete, errors occurred!
Project load failed
Reported error: solution load command failed (1)

I've changed the Zephyr base and board direcory in Segger as well

Any ideas where to look?

[Tron]

I've also tried to create a totally new folder, following the getting started assistant in the NRFConnect app. Then, opening a project from the samples/nrf folder (gps), initializing the project fails ,and I get the message

Executing the below command failed. Are permissions set correctly?

'C:/Program Files/segger/arm_segger_embedded_studio_v420a_win_x64_nordic/bin/cc.exe --version'

When I try to execute the given command in a cli, i get the reply 
cc.exe: error: unrecognised option --version
cc.exe: error: -o option required