I'm struggling to understand exactly which 'Get Data' function you are using from your description, can you provide a more concise description?
In regards to launching certain windows browse file dialogues (e.g. selecting 'browse' via Datasource 'file' option) i am getting the same behaviour when nothing happens (i.e. no visible change). It happens most often when ReadyAPI! has been launched quite recently. The issur is intermittent and doesn't occur all the time. I'm using v2.7.0 also.
I noticed an error being reported in the logging when i tried selecting the function and there was no visible change. I actually pasted the relevant path into the field (instead of allowing the functionality to dynamically build the path) and that did actually work.
Is the erroneous behaviour intermittent? Have you checked the logs?
if this helped answer the post, could you please mark it as 'solved'? Also if you consider whether the title of your post is relevant? Perhaps if the post is solved, it might make sense to update the Subject header field of the post to something more descriptive? This will help people when searching for problems. Ta