1. Here's why

There are several potential causes:

1.1: Overzealous anti-virus software that prevents Lumion from saving the file correctly.

1.2: Saving Photos or .MP4 Movie files directly to cloud back-up folders, e.g. OneDrive. The back-up software might 'lock' the files before Lumion is done saving them which can result in file corruption.

1.3: Saving Photos or .MP4 Movie files to a network drive. If the connection drops out while saving the file, the file can become corrupted.

1.4: Lack of Windows permissions. For example if the Windows User Account is a 'Standard' account instead of an 'Administrator' account.

1.5: Using a Windows User Account name with non-Latin characters, for example Japanese or Chinese characters.

2. Recommendations

To prevent save errors, we recommend that you follow these instructions:

2.1: Please follow the instructions in step 1.1 and 1.3 in the article below to add an exclusion for Lumion to your security software:

Knowledge Base: How do you resolve anti-virus and firewall problems?

2.2: Always save Photos and .MP4 Movie files to a local harddrive. If the final destination is a network drive or a cloud back-up folder/service, please move the Photos and .MP4 Movie files from the local harddrive when Lumion is done saving the files.

2.3: Verify that the Windows User Account type is an Administrator account. If it is a Standard account, please click on the link below and follow the instructions to change it to an Administrator account:

External Link: How to change a Windows 10 user account type

If your system administrator does not allow you to use an 'Administrator' account, you will have to right-click on 'Lumion.exe' in the Lumion installation folder and select Run as administrator.

2.4: If the Windows User Account name contains non-Latin characters (e.g. Japanese or Chinese characters), please create a new Windows User Account using a name that only contains Latin characters. The account type must be 'Administrator' (not 'Standard').

External Link: Create a local user or administrator account in Windows 10

2.5: Verify that the full path for the following folders do not contains non-Latin characters (e.g. Japanese or Chinese characters):

• (DRIVE):\...Documents/Lumion (VERSION)
• (DRIVE):\...Users\(USERNAME)\AppData\Local\Lumion (VERSION)

Examples:

• C:\Users\Username\Documents\Lumion 9.0
• C:\Users\Username\AppData\Local\Lumion 9.0

2.6: Verify that the Windows User Account has got full read and write permissions for the following folders:

• (DRIVE):\...Documents/Lumion (VERSION)
• (DRIVE):\...Users\(USERNAME)\AppData\Local\Lumion (VERSION)

Examples:

• C:\Users\Username\Documents\Lumion 9.0
• C:\Users\Username\AppData\Local\Lumion 9.0

External Link: How to take ownership of files and folders on Windows 10