CWX Project is an easy to use Project Management and ToDo-List application for WordPress Blogs, encouraging collaborative work.
IE 8 and older are not supported. Support for IE 8 has been dropped on Jun., 1st 2014.
Other browsers that do not work with CWX Project are too old and/or have insufficient support for HTML5 and/or CSS3. CWX Project uses HTML5 for markup, but it has fallbacks for browsers that don't understand it, so it's very unlikely a show-stopper. However, some browsers do not handle the HTML5 progress-tag right, which looks ugly. CWX Project uses CSS3, but implements fallbacks for cases a browser doesn't know a certain property or value. The most problematic one is 'width: calc();', which is used to compute the dynamic width of project and task titles (the fallback here is just 'width: 45%;', which can lead to ugly looking rows).
Post a little report under the support tab of the plugin page. It's very likely that the issue will be fixed within reasonable time.
For a first release it's only normal to have bugs. If you report the bugs, they will be eliminated much faster.
Well, if I promised to implement a feature, I definately will. But understand, my time is somewhat limited. Besides that, it depends on how many people are interested in the plugin. Time will tell.