Based on this post by the OP it sounds like this is the problem!

Just to add a little info: Unfortunately the 5.24.1 doc is not up on http://perldoc.perl.org yet, so here is the link to the source. It seems that do's mechanism of searching @INC was impacted by this change - some interesting further reading for the curious is in the P5P threads The tricky issue of do() and [perl #131069] do file: Add './' in additional cases. Update: So as far as I understand it, the issue might be improved upon in v5.26 when that gets released.

In reply to Re^5: 'do' command is dead? Surely not? by haukex
in thread 'do' command is dead? Surely not? by ACI

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