AttributeError: 'CaptureManager' object has no attribute 'suspendcapture'

Suddenly hitting this exception:

`AttributeError: 'CaptureManager' object has no attribute 'suspendcapture'`

when trying to set a breakpoint with `import pudb; pudb.set_trace()`, although exactly the same result with `from pudb import set_trace; set_trace()`. Using `2017.1.4`. No problem with `pdb`, `pdbpp`, etc.

I get the feeling something else might have changed in my environment somehow because I've never had an issue with `pudb` before.

Start by reproducing the exception through the reported pudb.set_trace() entry point using version 2017.1.4, then inspect how CaptureManager is involved in the breakpoint path. Done means setting a breakpoint no longer raises AttributeError for the reported environment.

Written by the indexing model from the issue text.