thanks for movie, great job!
I think I solve your probolem. In movie I see You have own slug in slides category “Front page”. Please delete this slug. This is a bug but now I don’t have time to correct it. Please give me signal if that is ok.
I update WP to 3.5.1 and on my page it still work. Ok maybe it is problem with theme. But one more thing, categories are not display in widget area if any slide is not added to it. Do You create some slides and add them to slides category?
Yep it was a bug!. On end of ml-post-slider.php file were some white spaces. I think it generate this type of error. I relased version 1.0.1 without this white spaces. Please download and install new version of plugin and let me know if everything is okay. Thanks for signal;)