I get a really wierd error message - do you have an idea where I should start looking?

Hi

am getting a really strange error message and I was hoping you could help, I tried the same module on a fresh install which works alright, to me this seems like a compatibility issue with other modules.

Do you know where I should start looking?

{ "status": true, "data": "\x3cdiv class=\"messages warning\"\x3e\nFor easier theme development, the theme registry is being rebuilt on every page request. It is \x3cem\x3eextremely\x3c/em\x3e important to \x3ca href=\"/admin/build/themes/settings/brandtner\"\x3eturn off this feature\x3c/a\x3e on production websites.\x3c/div\x3e\n\x3cdiv id=\"edit-field-teaser-bild-0-ahah-wrapper\"\x3e\x3cdiv class=\"form-item\" id=\"edit-field-teaser-bild-0-upload-wrapper\"\x3e\n \x3clabel for=\"edit-field-teaser-bild-0-upload\"\x3eTeaser-Bild: \x3c/label\x3e\n \x3cdiv class=\"filefield-element clear-block\"\x3e\x3cdiv class=\"widget-preview\"\x3e\x3cdiv class=\"imagefield-preview\"\x3e\x3cimg src=\"http://dev.renditestrategie.de/sites/default/files/imagefield_thumbs/med...\" title=\"Diagramm_Gewinn_Zeit.png\" alt=\"Image preview\" /\x3e\x3c/div\x3e\x3c/div\x3e\x3cdiv class=\"widget-edit\"\x3e\x3cinput type=\"hidden\" name=\"field_teaser_bild[0][fid]\" id=\"edit-field-teaser-bild-0-fid\" value=\"199\" /\x3e\n\x3cinput type=\"hidden\" name=\"field_teaser_bild[0][list]\" id=\"edit-field-teaser-bild-0-list\" value=\"1\" /\x3e\n\x3cinput type=\"submit\" name=\"field_teaser_bild_0_filefield_remove\" id=\"edit-field-teaser-bild-0-filefield-remove\" value=\"Entfernen\" class=\"form-submit\" /\x3e\n\x3c/div\x3e\x3c/div\x3e\n\x3c/div\x3e\n\x3c/div\x3e\x3cscript type=\"text/javascript\"\x3ejQuery.extend(Drupal.settings.ahah, { \"edit-field-teaser-bild-0-filefield-upload\": { \"url\": \"/filefield/ahah/blog/field_teaser_bild/0\", \"event\": \"mousedown\", \"keypress\": true, \"wrapper\": \"edit-field-teaser-bild-0-ahah-wrapper\", \"selector\": \"#edit-field-teaser-bild-0-filefield-upload\", \"effect\": \"fade\", \"method\": \"replace\", \"progress\": { \"type\": \"throbber\" }, \"button\": { \"op\": \"Upload\" } }, \"edit-field-teaser-bild-0-filefield-remove\": { \"url\": \"/filefield/ahah/blog/field_teaser_bild/0\", \"event\": \"mousedown\", \"keypress\": true, \"wrapper\": \"edit-field-teaser-bild-0-ahah-wrapper\", \"selector\": \"#edit-field-teaser-bild-0-filefield-remove\", \"effect\": \"fade\", \"method\": \"replace\", \"progress\": { \"type\": \"throbber\" }, \"button\": { \"field_teaser_bild_0_filefield_remove\": \"Entfernen\" } } });\x3c/script\x3e" }