Dynamics CRM Change Status Workflow error -

i have workflow that runs update status of case record resolved. however, workflow gets put status 'waiting' , contains generic error message. when looking @ system job message says:

this has worked on system (as doing updating status) assume has customizations in place.

has else ever come across , how did resolve it?

thanks in advance

update:

i have created new organisation test out possible solutions , narrow down might happening.

i created workflow on blank organisation , test case record try out on. worked fine expected.

i imported customizations on customers system. did same again , worked fine.

i created new case record , tried original workflow, did not work.

i added workflow same first workflow , tried on pre customizations record, worked.

i tried new workflow on new record , once again did not work.

it therefore appearing workflows not working on records post customization import.

has come across before, , steps taken resolve?

thanks again

if have possibility @ registered plugins, search plugin registered on message setstate or setstatedynamicentity entity case (incident).

i assume there plugin fails in case. reason error message.