@cclaerhout
It looks like some html-> bbcode is failing to roundtrip.
Someone is using this bbcode, and it fails fairly badly when going from RTF Editor -> bbcode -> RTF Editor -> bbcode
[B][COLOR=rgb(12, 74, 204)]S[/COLOR][COLOR=rgb(14, 76, 203)]o[/COLOR] [COLOR=rgb(19, 82, 203)]t[/COLOR][COLOR=rgb(22, 85, 203)]h[/COLOR][COLOR=rgb(25, 87, 202)]e[/COLOR][COLOR=rgb(27, 90, 202)]r[/COLOR][COLOR=rgb(30, 93, 202)]e[/COLOR][COLOR=rgb(32, 96, 202)]'[/COLOR][COLOR=rgb(35, 99, 202)]s[/COLOR] [COLOR=rgb(40, 104, 201)]t[/COLOR][COLOR=rgb(43, 107, 201)]h[/COLOR][COLOR=rgb(45, 110, 201)]i[/COLOR][COLOR=rgb(48, 112, 200)]s[/COLOR] [COLOR=rgb(53, 118, 200)]c[/COLOR][COLOR=rgb(56, 121, 200)]o[/COLOR][COLOR=rgb(58, 124, 200)]l[/COLOR][COLOR=rgb(61, 126, 199)]o[/COLOR][COLOR=rgb(64, 129, 199)]r[/COLOR] [COLOR=rgb(69, 135, 199)]g[/COLOR][COLOR=rgb(72, 138, 199)]r[/COLOR][COLOR=rgb(69, 135, 199)]a[/COLOR][COLOR=rgb(66, 132, 199)]d[/COLOR][COLOR=rgb(64, 129, 199)]i[/COLOR][COLOR=rgb(61, 126, 199)]e[/COLOR][COLOR=rgb(58, 124, 200)]n[/COLOR][COLOR=rgb(56, 121, 200)]t[/COLOR] [COLOR=rgb(51, 115, 200)]I[/COLOR] [COLOR=rgb(45, 110, 201)]u[/COLOR][COLOR=rgb(43, 107, 201)]s[/COLOR][COLOR=rgb(40, 104, 201)]e[/COLOR] [COLOR=rgb(35, 99, 202)]s[/COLOR][COLOR=rgb(32, 96, 202)]o[/COLOR][COLOR=rgb(30, 93, 202)]m[/COLOR][COLOR=rgb(27, 90, 202)]e[/COLOR][COLOR=rgb(25, 87, 202)]t[/COLOR][COLOR=rgb(22, 85, 203)]i[/COLOR][COLOR=rgb(19, 82, 203)]m[/COLOR][COLOR=rgb(17, 79, 203)]e[/COLOR][COLOR=rgb(14, 76, 203)]s[/COLOR][COLOR=rgb(12, 74, 204)].[/COLOR][/B]
I'll try doing some more debugging this weekend.