I have also had this issue. The error message in the browser is something like this :
HTTP Status 400 -
type Status report
message
description The request sent by the client was syntactically incorrect.
The underlying problem looks like a bug in the form representation request payload. The sample request I have pasted below shows that an unexpected "sizeY" field is added to the drop down field definition. I say it's unexpected because the OptionFormField in the form-model module doesn't have an equivalent field and that seems to be the reason why the request can't be processed. It looks to me like sizeY should be a field of the params object.
{"reusable":false,"newVersion":true,"comment":"","formRepresentation":{"id":5,"name":"Perform Initial Troubleshooting","key":"PerformInitialTroubleshooting","description":"Perform Initial Troubleshooting","version":4,"lastUpdatedBy":"admin","lastUpdated":"2016-12-20T14:54:08.271+0000","formDefinition":{"name":"Perform Initial Troubleshooting","key":"PerformInitialTroubleshooting","fields":[{"fieldType":"ExpressionFormField","id":"label","name":"Label","type":"expression","value":null,"required":false,"readOnly":false,"overrideId":false,"placeholder":null,"layout":null,"expression":"Customer Name\n${customerName}","params":{}},{"fieldType":"ExpressionFormField","id":"label","name":"Label","type":"expression","value":null,"required":false,"readOnly":false,"overrideId":false,"placeholder":null,"layout":null,"expression":"Phone Number\n${phoneNumber}","params":{}},{"fieldType":"ExpressionFormField","id":"label","name":"Label","type":"expression","value":null,"required":false,"readOnly":false,"overrideId":false,"placeholder":null,"layout":null,"expression":"Email Address\n${emailAddress}","params":{}},{"fieldType":"ExpressionFormField","id":"label","name":"Label","type":"expression","value":null,"required":false,"readOnly":false,"overrideId":false,"placeholder":null,"layout":null,"expression":"Fault Description\n${faultDescription}","params":{}},{"fieldType":"OptionFormField","id":"productGroup","name":"Product Group","type":"dropdown","value":"Please choose one...","required":true,"readOnly":false,"overrideId":true,"placeholder":null,"layout":null,"optionType":null,"hasEmptyValue":true,"options":[{"id":null,"name":"Please choose one..."},{"name":"4G Business"},{"name":"4G Residential"}],"params":{},"sizeY":1}],"outcomes":[{"id":null,"name":""}]}},"formImageBase64":"data:image/png;base64,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"}
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