I installed Tbird portable in dropbox to be able to access my pop email from different computers. All went well until yesterday. Tbird hangs on opening inbox folder and I can't see nor access my mail in that folder. All other folders are accessible. I've tried to repair it but it hangs also on repair. Any suggestions please how this may be repaired?

Error console: Could not read chrome manifest 'file:///X:/Dropbox/ThunderbirdPortable/App/thunderbird/chrome.manifest'. Timestamp: 5-8-2014 11:56:26 Error: ERROR addons.xpi: Error processing file changes: [Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [mozIStorageStatement.execute]" nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)" location: "JS frame :: resource://gre/modules/XPIProvider.jsm -> resource://gre/modules/XPIProviderUtils.js :: executeStatement :: line 226" data: no] Source File: resource://gre/modules/XPIProvider.jsm -> resource://gre/modules/XPIProviderUtils.js Line: 226 Could not read chrome manifest 'file:///X:/Dropbox/ThunderbirdPortable/Data/profile/extensions/it-IT@dictionaries.addons.mozilla.org/chrome.manifest'. Could not read chrome manifest 'file:///X:/Dropbox/ThunderbirdPortable/App/thunderbird/extensions/%7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D/chrome.manifest'. While creating services from category 'profile-after-change', could not create service for entry 'Disk Space Watcher Service', contract ID '@mozilla.org/toolkit/disk-space-watcher;1' Timestamp: 5-8-2014 11:56:33 Error: Component returned failure code: 0x80550005 [nsIMsgFolder.updateFolder] Source File: resource://gre/modules/dbViewWrapper.js Line: 93 Timestamp: 5-8-2014 11:56:34 Error: Please do not load stuff in the multimessage browser directly, use the SummaryFrameManager instead. Source File: resource://gre/modules/summaryFrameManager.js Line: 85 Timestamp: 5-8-2014 11:57:47 Error: [Exception... "Component returned failure code: 0x80550005 [nsIMsgFolder.msgDatabase]" nsresult: "0x80550005 (<unknown>)" location: "JS frame :: chrome://messenger/content/folderDisplay.js :: FolderDisplayWidget__getDefaultColumnsForCurrentFolder :: line 504" data: no] Source File: resource://gre/modules/dbViewWrapper.js Line: 219 Timestamp: 5-8-2014 12:01:17 Error: Component returned failure code: 0x80550005 [nsIMsgFolder.updateFolder] Source File: resource://gre/modules/dbViewWrapper.js Line: 93 Timestamp: 5-8-2014 12:40:00 Error: Component returned failure code: 0x80550005 [nsIMsgFolder.updateFolder] Source File: resource://gre/modules/dbViewWrapper.js Line: 93 Timestamp: 5-8-2014 13:00:24 Error: [Exception... "Component returned failure code: 0x80550005 [nsIMsgFolder.msgDatabase]" nsresult: "0x80550005 (<unknown>)" location: "JS frame :: chrome://messenger/content/folderDisplay.js :: FolderDisplayWidget__getDefaultColumnsForCurrentFolder :: line 504" data: no] Source File: resource://gre/modules/dbViewWrapper.js Line: 219 Timestamp: 5-8-2014 13:00:49 Error: Component returned failure code: 0x80550005 [nsIMsgFolder.updateFolder] Source File: resource://gre/modules/dbViewWrapper.js Line: 93