Bug Report: Grading taking too long

[tubaace]

The question requesting a translation from German to English of the sentence, "Sie sagten, sie hätten dieses Auto nicht geprüft." from the German lesson "Verbs: Conditional Perfect 1". Every time this specific question comes up in the lesson, it takes upwards of one minute to grade.

Important note: this does not occur on other questions regarding the same sentence, i.e. translating from English to German or multiple choice questions.

OS: W7

Browser: Google Chrome

Reproduction: 5/5