Possible bugs should be reported in the Report an Issue section of the forum. There are techs from FileMaker that monitor that section and will work with you to either confirm the bug and get as complete a description as possible.
I recommend that you click the tab at the top of this screen for Report an Issue and report this there. "there are formatting changes that have occurred" is pretty vague. A more complete description and/or an uploaded screen shot illustrating the changes would be helpful.
Also, you have two PC's. Does one host and the other connect as a client? If so, which was updated, the host or the client machine?