autocomplete doesn't 'refresh' properly

autocomplete doesn't 'refresh' properly

Today I encountered a issue with the autocomplete script from jqueryui.com/autocomplete/
I'm extending my limesurvey survey with the plugin, so the user can select a string from a pretty big list of entries. In limesurvey you can add conditions, so a question will only be shown if something particular is entered.
I added the text field with the plugin to a condition for another question. If a certain string is entered a new questions appears. If I scroll through the suggestions provided by the script with the arrow keys and i hit a string out of the conditions the new question appears. Same thing if I enter the string completely manually. BUT if i click a matching string, the input doesn't seem to refresh and the additional question does not appear! If I clicked the string and press an arrow key (on a pc keyboard) the input is accepted/refreshed and the question appears.
Because the survey will be carried out using mobile phones the only way a string will be selected is by "clicking" it, so I really need this to work. Does anybody know a workaround for this?