We made some major code changes for Visforms 3.5.2 and moved the code, that is responsible for displaying the field in the frontend form view to a new location (folder). In some rare cases this folder is not copied properly during the update process. Luckily this happens very rarely but this is the reason, why we were not yet able to figure why this happens. But you can easily fix the problem yourself.
Unzip the installation package.
Copy the folder
site/layoutsfrom the installation package to
components/com_visformson the server.