Created a new SharePoint 2010 List Definition project, Sandbox deployment option. List Definition type: Documents Library. When attempting to save into the document library from Microsoft Word 2010 I get "The webpage no longer exists" error in the File Save dialog
If I change the type of the solution to Farm solution it works as expected.
IISLOGS:
2013-12-19 10:12:01 127.0.0.1 PROPFIND / - 80 0#.w|domain\username 127.0.0.1 Microsoft-WebDAV-MiniRedir/6.1.7601 207 0 0 35
2013-12-19 10:12:01 127.0.0.1 PROPFIND /sites - 80 0#.w|domain\username 127.0.0.1 Microsoft-WebDAV-MiniRedir/6.1.7601 207 0 0 26
2013-12-19 10:12:01 127.0.0.1 PROPFIND /sites/team1 - 80 0#.w|domain\username 127.0.0.1 Microsoft-WebDAV-MiniRedir/6.1.7601 207 0 0 30
2013-12-19 10:12:01 127.0.0.1 PROPFIND /sites/team1/Lists - 80 0#.w|domain\username 127.0.0.1 Microsoft-WebDAV-MiniRedir/6.1.7601 207 0 0 32
2013-12-19 10:12:01 127.0.0.1 POST /_vti_bin/shtml.dll/_vti_rpc - 80 0#.w|domain\username 127.0.0.1 Microsoft-WebDAV-MiniRedir/6.1.7601 200 0 0 10
2013-12-19 10:12:01 127.0.0.1 HEAD /sites/team1/_vti_bin/owssvr.dll dialogview=FileSave&FileDialogFilterValue=*.*&location=Lists/ListDefinitionProject1-ListInstance1 80 - 127.0.0.1 non-browser;+(Windows+NT+6.1.7601) 401 0 0 6
2013-12-19 10:12:01 127.0.0.1 HEAD /sites/team1/_vti_bin/owssvr.dll dialogview=FileSave&FileDialogFilterValue=*.*&location=Lists/ListDefinitionProject1-ListInstance1 80 - 127.0.0.1 non-browser;+(Windows+NT+6.1.7601) 401 1 2148074254 2
2013-12-19 10:12:01 127.0.0.1 HEAD /_vti_bin/owssvr.dll dialogview=FileSave&FileDialogFilterValue=*.*&location=Lists/ListDefinitionProject1-ListInstance1 80 0#.w|domain\username 127.0.0.1 non-browser;+(Windows+NT+6.1.7601) 200 0 0 23
2013-12-19 10:12:01 127.0.0.1 GET /sites/team1/_vti_bin/owssvr.dll dialogview=FileSave&FileDialogFilterValue=*.docx&location=Lists%2FListDefinitionProject1-ListInstance1 80 - 127.0.0.1 non-browser;+(Windows+NT+6.1.7601) 401 0 0 10
2013-12-19 10:12:01 127.0.0.1 GET /sites/team1/_vti_bin/owssvr.dll dialogview=FileSave&FileDialogFilterValue=*.docx&location=Lists%2FListDefinitionProject1-ListInstance1 80 - 127.0.0.1 non-browser;+(Windows+NT+6.1.7601) 401 1 2148074254
2
2013-12-19 10:12:01 127.0.0.1 GET /_vti_bin/owssvr.dll dialogview=FileSave&FileDialogFilterValue=*.docx&location=Lists%2FListDefinitionProject1-ListInstance1 80 0#.w|domain\username 127.0.0.1 non-browser;+(Windows+NT+6.1.7601) 410 0 0 34
2013-12-19 10:12:01 127.0.0.1 PROPFIND /sites/team1/Lists/ListDefinitionProject1-ListInstance1 - 80 0#.w|domain\username 127.0.0.1 Microsoft-WebDAV-MiniRedir/6.1.7601 207 0 0 36