Hi,
This is because you are using the old solpart menu. To fix it, you need to change the following:
You need to modify your spmenu.js. It is located in controls\solpartmenu.
Around line 957 you will see the following:
if (spm_browserType() == 'op' )
Change it to
if (spm_browserType() == 'op' || spm_browserType() == 'safari')
Here is a word from the DNN skinning master Timo about solpart menu.
Thanks,
Mike