Try switching to the default theme and deactivating all other plugins.
Thanks for getting back to me. In the original post I did mention turning all plugins off and the problem occurring across several domains with various themes, so these do not seem to be the issue.
However, I have done a fresh install of the latest WordPress on a temp url and only installed the Contact Form 7 plugin using the default theme. This setup should alleviate any possible conflicts.
I have created a form with only a file upload field on it. Originally I thought it was a validation conflict but it appears not, there is no validation on this form. If the file upload field is left empty the form just hangs on submission, if you attach a file it goes through ok.
The vanilla test site url is http://test-sg4.klickhosting4.co.uk
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This reply was modified 8 years, 1 month ago by
BlackSheep42.
Me again. It appears to be a browser based issue. The failure occurs using Safari (v11.1 on macOS 10.12.6). Tried it on Chrome and Firefox on my Mac and Edge on a PC and they all work perfectly.
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This reply was modified 8 years, 1 month ago by
BlackSheep42.