User cannot send second question

Hello,

During my webinars, participants are not able to ask a second question. The filled in one question, but when they click ‘ask question’, this button turns in ‘one moment, please…’ and stays this way. Although I receive their question, their screen does not process that the question is sent, it stays telling ‘one moment, please’ and the button doesn’t change back in ‘ask question’. Only when they retype the webinar URL, they are able to ask a new question. How can this be resolved?

Yours sincerely,

Imke Wijnhorst

For your information:

—-WordPress Environment—-
Home URL : https://www.gezinsfundament.nl
Site URL : https://gezinsfundament.nl
WP Version : 4.6.1
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—-Plugin Environment—-
Webinar System Version : 1.6.3

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SUHOSIN Installed : Not Installed
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Server Timezone : UTC

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—-Active Plugins—-
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Contact Form 7 : doorTakayuki Miyoshi – [Version : 4.5.1]
Cookie Notice : doordFactory – [Version : 1.2.36.1]
Facebook Comments Plugin : doortalspotim – [Version : 2.3.6]
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Google Analyticator : doorSumoMe – [Version : 6.5.0.0]
Google Analytics Dashboard voor WP : doorAlin Marcu – [Version : 4.9.3.2]
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No Title Tooltips : doorKeef – [Version : 1.1.3]
WP Live Chat Support : doorWP-LiveChat – [Version : 6.2.11]
WP WebinarSystem Lite : doorLucy Eind – [Version : 1.6.3]

—-Theme—-
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Author URL : https://www.gezinsfundament.nl/