Edit segment now opens Trados

How do I solve the following:

I must have clicked something, as every time I now want to edit a segment, Xbench insists on opening a new copy of Trados, making editing nigh impossible.
This only happens when I’m in the Search view looking for a specific word.

On top of that I get the following error message:

Error processing command line arguments: Object reference not set to an instance of an object.

USAGE: SDLTradosStudio.exe [/help|/?] /arg1 val1 /arg2 val2

Task: Open Cloud Task
Description: Opens a cloud task in Trados Studio
Usage: SDLTradosStudio.exe /openLCTask <sdlproject.lctask.LC&taskId=&projectId=>
Arguments:
/openLCTask The URI of the cloud task to open

Task: Open Alignment
Description: Opens an alignment in the Alignment View.
Usage: SDLTradosStudio.exe /openAlignment
Arguments:
/openAlignment The full file path to the alignment you want to open.

Task: Open Retrofit
Description: Opens a retrofit file in the Alignment View.
Usage: SDLTradosStudio.exe /openRetrofit
Arguments:
/openRetrofit The full file path to the retrofit file you want to open.

Task: Create Project
Description: Starts the Create Project wizard.
Usage: SDLTradosStudio.exe /createProject [/files [ …]] [/name ] [/template ] [/referenceProject ]
Arguments:
/createProject Starts the Create Project wizard.
/files The full file path of one or more documents or folders to add to the Create Project wizard.
/name The name of the Project
/template An existing template name or file path to use.
/referenceProject An existing reference project file path to use.

Task: Open Document
Description: Opens a document or a number of documents in the Editor View.
Usage: SDLTradosStudio.exe /openDocument [ …]
Arguments:
/openDocument The full file path of one or more documents to open.

Task: Open File Based TM
Description: Opens a file based TM or a number of file based TMs in the TM View.
Usage: SDLTradosStudio.exe /openFileTm [ …]
Arguments:
/openFileTm The full file path of one or more TMs to open.

Task: Open Package
Description: Opens a package in the Package View.
Usage: SDLTradosStudio.exe /openPackage
Arguments:
/openPackage The full file path of the package to open.

Task: Open Project
Description: Opens a project in the Projects View.
Usage: SDLTradosStudio.exe /openProject
Arguments:
/openProject The full file path of a Project to open.

Task: Open Server Project
Description: Opens a server project in the Projects View.
Usage: SDLTradosStudio.exe /openServerProject
Arguments:
/openServerProject The URI of a Server Project to open.

Task: NoAutoUpdate
Description: Starts the application without automatically checking for updates.
Usage: SDLTradosStudio.exe /noautoupdate
Arguments:
/noautoupdate Starts the application without automatically checking for updates.