Virtual Programming Lab (plugin)

Dear Jonathan,
with so few details, is difficult to spot the problem.

Please, check that your teacher (editing-teacher) role has the proper capabilities:

minimum:
mod/vpl:view
mod/vpl:submit
mod/vpl:grade
mod/vpl:addinstance
mod/vpl:manage

optionals:
mod/vpl:similarity
mod/vpl:setjails

Best regards,
Juan Carlos.