Hello Theodor,
You probably need to rebuild all the standard/runtime (EWL) libs used in your project with compiler switch changed from -abi register to -abi compact.
There are several makefiles in "<CW MCU v10.x>\MCU\ColdFire_Support\ewl". You should adjust this compiler switch in the makefile that builds the libraries used by your project.
The instructions are documented in the compiler manual: "<CW MCU v10.x>\MCU\Help\PDF\MCU_ColdFire_Compiler.pdf", section "How to rebuild the EWL Libraries".
Hope it helps.
Stan