Wenn es im abgesicherten Modus funktioniert hast Du eine SW die nicht von Apple ist installiert die stört. Stell mal einen EtreCheck Report ein.
EtreCheck version: 5.4.8 (5091)
Report generated: 2020-02-16 17:14:36
Download EtreCheck from https://etrecheck.com
Runtime: 2:34
Performance: Excellent
Sandbox: Enabled
Full drive access: Disabled
Problem: Apps are crashing
Major Issues:
Anything that appears on this list needs immediate attention.
Runaway process - A process is using a large percentage of your CPU.
Unsigned files - There are unsigned software files installed that could be adware and should be reviewed.
More than one antivirus app - This machine has multiple antivirus apps installed.
Minor Issues:
These issues do not need immediate attention but they may indicate future problems or opportunities for improvement.
32-bit Apps - This machine has 32-bits apps will not work on macOS 10.15 “Catalina”.
Limited drive access - More information may be available with Full Drive Access.
Hardware Information:
iMac (27-inch, Mid 2011)
iMac Model: iMac12,2
1 2,7 GHz Intel Core i5 (i5-2500S) CPU: 4-core
12 GB RAM - Upgradeable
BANK 0/DIMM0 - 2 GB DDR3 1333
BANK 1/DIMM0 - 2 GB DDR3 1333
BANK 0/DIMM1 - 4 GB DDR3 1333
BANK 1/DIMM1 - 4 GB DDR3 1333
Video Information:
AMD Radeon HD 6770M - VRAM: 512 MB
iMac 2560 x 1440
Drives:
disk0 - Samsung SSD 850 EVO 1TB 1.00 TB (Solid State - TRIM: Yes)
Internal SATA 6 Gigabit Serial ATA
disk0s1 - EFI (MS-DOS FAT32) [EFI] 210 MB
disk0s2 [APFS Container] 1000.00 GB
disk1 [APFS Virtual drive] 1000.00 GB (Shared by 4 volumes)
disk1s1 - M****S (APFS) (Shared - 204.60 GB used)
disk1s2 - Preboot (APFS) [APFS Preboot] (Shared)
disk1s3 - Recovery (APFS) [Recovery] (Shared)
disk1s4 - VM (APFS) [APFS VM] (Shared - 20 KB used)
disk2 - SanDisk Cruzer Switch 15.66 GB
External USB 480 Mbit/s USB
disk2s1 - D***V (MS-DOS FAT32) 15.66 GB (1.21 GB used)
Mounted Volumes:
disk1s1 - M****S
1000.00 GB (Shared - 204.60 GB used, 795.16 GB available, 794.65 GB free)
APFS
Mount point: /
disk1s4 - VM [APFS VM]
1000.00 GB (Shared - 20 KB used, 794.65 GB free)
APFS
Mount point: /private/var/vm
disk2s1 - D***V
15.66 GB (1.21 GB used, 14.45 GB free)
MS-DOS FAT32
Mount point: /Volumes/D***V
Network:
Interface en0: Ethernet
Interface fw0: FireWire
Interface en5: iPhone
Interface bridge0: Thunderbolt Bridge
Interface en1: Wi-Fi
802.11 a/b/g/n
Interface en4: Bluetooth PAN
Interface vnic0: Parallels Shared #0
System Software:
macOS High Sierra 10.13.6 (17G66)
Time since boot: Less than an hour
Configuration Files:
/etc/hosts - Count: 1
Notifications:
Notifications not available without Full Drive Access.
Security:
Gatekeeper: Enabled
System Integrity Protection: Enabled
Antivirus software: Apple, Kaspersky, and CleanMyMac
Unsigned Files:
Launchd: /Library/LaunchDaemons/com.acronis.1_3.plist
Executable: /Library/Application Support/Acronis/Scheduler/schedwrapper -m retry -i 1
Details: Close match found in the whitelist - probably OK
Launchd: /Library/LaunchDaemons/net.exirion.ssdfanctrl.plist
Executable: /Library/StartupItems/SSDFanControl/ssdfanctrl
Details: Exact match found in the whitelist - probably OK
Launchd: /Library/LaunchDaemons/com.acronis.startup.plist
Executable: /Library/Application Support/Acronis/Scheduler/schedwrapper -m startup
Details: Exact match found in the whitelist - probably OK
Launchd:
/Library/LaunchDaemons/com.macpaw.CleanMyMac4.Agent.plist
Executable: /Library/PrivilegedHelperTools/com.macpaw.CleanMyMac4.Agent
Login Item: /Applications/CleanMyMac X.app/Contents/Library/LoginItems/CleanMyMac X Menu.app
Login Item: /Applications/CleanMyMac X.app/Contents/Library/LoginItems/CleanMyMac X Menu.app/Contents/Frameworks/DevMateKit.framework/Versions/A/Resources/Autoupdate.app
Login Item: /Applications/CleanMyMac X.app/Contents/Library/LoginItems/CleanMyMac X Menu.app/Contents/Frameworks/DevMateKit.framework/Versions/A/Resources/Problem Reporter Sandboxed.app
Login Item: /Applications/CleanMyMac X.app/Contents/Library/LoginItems/CleanMyMac X Menu.app/Contents/Library/LoginItems/CleanMyMac X HealthMonitor.app