These errors show up in the terminal window, not in the Leo Log Window. I don't see any problems working with files or the actual colorizing (at least not yet):
Traceback (most recent call last):
File "D:\Synced\github repos\leo\leo\core\leoColorizer.py", line 2055, in highlightBlock
self.colorizer.recolor(s)
File "D:\Synced\github repos\leo\leo\core\leoColorizer.py", line 1886, in recolor
self.mainLoop(n, s)
File "D:\Synced\github repos\leo\leo\core\leoColorizer.py", line 1837, in mainLoop
n = f(self, s, i)
File "D:\Synced\github repos\leo\leo\core\leoColorizer.py", line 1004, in match_doc_part
self.setRestart(self.restartDocPart)
File "D:\Synced\github repos\leo\leo\core\leoColorizer.py", line 1737, in setRestart
n = self.computeState(f, keys)
File "D:\Synced\github repos\leo\leo\core\leoColorizer.py", line 1682, in computeState
result = [self.languageTag(self.language)]
File "D:\Synced\github repos\leo\leo\core\leoColorizer.py", line 1923, in languageTag
name = name.replace(pattern, s)
AttributeError: 'NoneType' object has no attribute 'replace'