Hello, 

Thank you! I tried the beta and there is no "mumamo-do-fontify" error in the mini-buffer anymore. However, I get lots of these errors instead, when moving through the document: 


start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [3 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [32 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [3 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [7 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [3 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [7 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [3 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(580 javascript-mode (nxml-mode))
start-in-cons=nil [7 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [110 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [113 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil
ERROR: new-way /= old-way
start-in-cons=nil [43 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [10 times]
pos=1962, old-chunk=#<overlay from 1962 to 1985 in test.php>
start-in-cons=nil [3 times]
pos=1985, old-chunk=#<overlay from 1985 to 2035 in test.php>
start-in-cons=nil [3 times]
pos=2035, old-chunk=#<overlay from 2035 to 2059 in test.php>
start-in-cons=nil [3 times]
pos=2059, old-chunk=#<overlay from 2059 to 2116 in test.php>
start-in-cons=nil [3 times]
pos=2116, old-chunk=#<overlay from 2116 to 2140 in test.php>
start-in-cons=nil [3 times]
pos=2140, old-chunk=#<overlay from 2140 to 2196 in test.php>
start-in-cons=nil [85 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [80 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [2 times]
start-in-cons=(1415 css-mode (nxml-mode))
start-in-cons=nil [55 times]


The output of nxhtmltest-run-Q is again: 

Test message
Ran 30 tests, 30 results were as expected
Wrote /home/ecce/tmp/lisp/nxhtml/tests/temp-test.el
nxhtmltest-bin-Q=/home/ecce/tmp/lisp/nxhtml/tests/
nxhtml-auto-start=/home/ecce/tmp/lisp/nxhtml/autostart.el
After set nxhtmltest-run-Q=run
let*: Wrong type argument: stringp, nil