[Plugin: iProject Web] ajax is not working in WP

I experience this as well, and I have identified this particular issue to a conflict with the Simple Business Manager plugin. It may not be this plugin in your case, but perhaps another plugin. SO you may want to check by turning off all other plugins to see if you regain Ajax functionality. If you do, then turn on other plugins one-at-a-time, and test Ajax functionality after turning each plugin on, to identify the conflicting plugin.